I got this question from a reader today, so I thought I would answer it on the blog. If you have any questions, always feel free to email me HERE.
I recently ordered worms to make worm compost and just put them into their bin yesterday. I thought everything was ok and had let the bin sit for a few days before adding the worms. Today, though, when I looked inside a lot of my worms were climbing up the sides of the bin. Am I doing something wrong? I'm worried that they're trying to get out for a reason. Why don't they want to stay in?
There are a few different reasons why your worms may be trying to escape their bin. I have experienced the following:
Not enough light up top to keep the worms in
Not a clear separation between bedding/food and the outside world
Noxious gases threatening the worms
Excessive heat in the bin
Not enough light up top to keep the worms in
When you are starting up a new bin it is very common for worms to try to escape, simply because they are a little lost. While they get used to their new surroundings and food source, try leaving a light on over the bin (not too close so you don't heat it up). Leave the lid off if you can while they figure this out. Once they dig down in there and get established, they probably won't be so keen to roam away from the plentiful food source of your kitchen scraps!
Not a clear separation between bedding/food and the outside world
I have been having a problem lately at the warehouse with escaping worms. In many bins I will open up the lids and find little piles of worms all along the top edges of the bin. These bins are doing great otherwise, no anaerobic pockets, lots of food and water, so I was a little perplexed at first. Then I realized that since I'm now using closed bins (to keep out flies and rodents) there are more evaporated droplets accumulating along the sides and underside of the bins. The worms aren't unhappy, seemingly, but they're coming out of their bedding because they're attracted to the water (think of a wet sidewalk crawling with worms after a rain).
Solution? A nice thick layer (4" or so) of dry bedding (or in my case manure) at the top. Once they hit the dry stuff on their way up, they turn around and head back down. I also get less water along the sides of the bin this way.
Noxious gases threatening the worms
It is possible that you have anaerobic conditions developing. Anaerobic means there isn't enough oxygen circulating in your compost scraps, and the scraps don't break down properly, producing something called "anaerobic sludge". It has an unmistakable smell that will linger on your nostrils for hours (blech!), or in my case may scar you for life! :-) If you dig down into your bedding and smell something nasty, that may be your problem. If you have a closed bin (ie: with a lid), noxious gases can accumulate in the bin and drive the worms to flee. Here's how to fix it.
1. Open the lid of your bin and leave it off for a day or two if you can.
2. Stir the contents of your bin and add a lot of dry bedding (shredded paper or cardboard works great) to both provide air flow and soak up any excess water. Anaerobic conditions and too much water usually go hand in hand.
3. Consider drilling extra holes into the side of your bin to provide more air flow (don't do this if you have an expensive setup, just if you've made your own bin).
4. Check on your bin daily until the problem resolves. Don't add any new scraps until the smell starts to disappear.
If you have an open system already and are having this problem, it's probably because you've been overwatering. Follow steps 2-4.
Excessive heat in the bin
Cooked worms are something you DON'T want, believe me! When I first started I messed up royally and got cooked worms AND anaerobic sludge and it is a smell I will never forget. If your bin is in direct sunlight, you are going to have problems, even if it's just for a couple of hours a day. A plastic bin in the sun will trap heat and kill worms very quickly. Worms can survive in high temperatures if they're in the shade, but 75 degrees in the sun will kill them.
ALWAYS KEEP YOUR WORM BIN OUT OF THE SUN!!!
If you have a compost pile without plastic sides, that's a different story, so you only really need to worry about this problem with plastic systems.
There's a bit of a learning curve with worms and making worm compost, but hopefully this site can help you learn from my mistakes instead of your own.
Good Worming!
Where to buy Red Wigglers?
HEREWhere to buy European Nightcrawlers?
HERE